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The prognostic significance of proteinuria: the Framingham study
Insights
Proteinuria, or protein in urine, significantly increases mortality risk in the general population. This condition, even in casual samples, indicates serious health issues and widespread vascular damage.
Area of Science:
- Nephrology
- Cardiology
- Epidemiology
Background:
- Proteinuria's prognostic significance in the general ambulatory population is not well-established.
- Existing clinical experience with proteinuria lacks comprehensive prognostic data for the broader community.
Purpose of the Study:
- To investigate the prognostic value of proteinuria in a large, general population cohort.
- To determine the association between proteinuria and mortality risk in ambulatory individuals.
Main Methods:
- Analysis of a 16-year Framingham cohort study involving 5209 men and women.
- Assessment of proteinuria in casual urine specimens and its correlation with mortality rates.
- Examination of proteinuria in relation to hypertension, diabetes, and cardiac enlargement.
Main Results:
- Proteinuria was associated with a threefold increase in mortality rate.
- Proteinuria was more prevalent in hypertensive, diabetic, and individuals with cardiac enlargement.
- In men, proteinuria independently predicted increased overall and cardiovascular mortality, even after accounting for other risk factors.
Conclusions:
- Proteinuria in the ambulatory general population is a significant indicator of poor prognosis.
- The presence of proteinuria suggests underlying widespread vascular damage.
- Proteinuria is not a benign finding and warrants serious clinical consideration.
Abstract:
Despite considerable clinical experience with proteinuria, its prognostic meaning in the ambulatory general population is poorly documented. From a 16-year study of 5209 men and women in the Framingham cohort it is evident that proteinuria, even in casual urine specimens, carries substantial risk with the mortality rate increased threefold. Proteinuria was three times as common in hypertensive persons and also occurred to excess in diabetic patients and in persons with cardiac enlargement. In the absence of these factors, proteinuria was so uncommon that its risk could not be accurately assessed. Among persons with these associated risk factors, those with proteinuria have higher death rates than those without proteinuria. In men, overall mortality and cardiovascular mortality rates remained significantly increased even when other contributors to risk were taken into account. Proteinuria in the ambulatory general population is not a benign condition and carries a serious prognosis. It appears to reflect widespread vascular damage.